EP0382722B1 - Wasserfahrzeug - Google Patents

Wasserfahrzeug Download PDF

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Publication number
EP0382722B1
EP0382722B1 EP88903749A EP88903749A EP0382722B1 EP 0382722 B1 EP0382722 B1 EP 0382722B1 EP 88903749 A EP88903749 A EP 88903749A EP 88903749 A EP88903749 A EP 88903749A EP 0382722 B1 EP0382722 B1 EP 0382722B1
Authority
EP
European Patent Office
Prior art keywords
hull
chamber
keels
centre keel
side keels
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88903749A
Other languages
English (en)
French (fr)
Other versions
EP0382722A1 (de
EP0382722A4 (en
Inventor
John Antony Lund
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STOLKRAFT SOUTH QUEENSLAND Pty Ltd
Original Assignee
STOLKRAFT SOUTH QUEENSLAND Pty
STOLKRAFT SOUTH QUEENSLAND Pty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by STOLKRAFT SOUTH QUEENSLAND Pty, STOLKRAFT SOUTH QUEENSLAND Pty Ltd filed Critical STOLKRAFT SOUTH QUEENSLAND Pty
Publication of EP0382722A1 publication Critical patent/EP0382722A1/de
Publication of EP0382722A4 publication Critical patent/EP0382722A4/en
Application granted granted Critical
Publication of EP0382722B1 publication Critical patent/EP0382722B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/16—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces
    • B63B1/18—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydroplane type
    • B63B1/20—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydroplane type having more than one planing surface

Definitions

  • the present invention relates to a water craft.
  • a water craft comprising a planing hull.
  • the hull includes a rear pressure-retaining chamber or tunnel aft of a transverse step in the hull and extending to the transom.
  • Air intakes in the forward part of the hull communicate with the chamber via air vents in the transverse step whereby the forward motion of the craft causes air to be charged via the vents into the chamber to form an air cushion which supports the hull in a planing mode.
  • Hulls which utilize a supporting air cushion in this manner are generally known as "ground effect" machines.
  • U.K. Patent No. 1542639 discloses a planing hull which is of monohull form and having a step at the front end of a tunnel extending to the rear of the hull.
  • the hull includes two planing surfaces on opposite sides of the tunnel, however, these surfaces rise upwardly above the lowest part of the bow section of the hull prior to the step.
  • the tunnel arrangement in this hull is primarily designed for improving high speed operation in calm waters.
  • U.K. Patent No. 1218688 defines a multi-hulled water craft, having a central hull and two side hulls with an upward step in the centre hull rearwardly from the bow.
  • the centre hull continues for the full length of the hull with the step in the centre hull only reducing the depth of that hull.
  • This configuration of hull is primarily designed to prevent porpoising of a water craft and the step configuration is not such as would create sufficient back pressure to draw in air into the tunnel rearwardly of the centre hull.
  • French Publication No. 2515125 proposes hulls in which air is channelled beneath the hull, however, these hulls do not have a tunnel or chamber which is formed to confine the air and provide for a "ground effect" principle.
  • An object of the invention is to provide a planing hull of the ground effect type which has improved drag characteristics at low to medium speeds.
  • a planing hull for a water craft comprising two side keels and a centre keel therebetween, said centre keel terminating rearwardly at a transverse step defining a forward wall of a downwardly open chamber flanked at each side by said side keels, said side keels each extending forwardly of said transverse step to define a pair of passages between said centre keel and said side keels, said transverse step extending laterally to said side keels and said passages terminating rearwardly at said transverse step, and said chamber serving to confine a cushion of air which supports the hull in the planing mode, supply of air to the chamber being wholly via the underside of the hull by being channelled in said passages between the centre keel and the side keels.
  • keels designates the hull-like portions of the water craft such as encountered in multi-hulled water craft which have two or more hull-like portions.
  • the upper wall of the chamber is substantially planar and extends substantially parallel to the tips of the keels.
  • the term "tips" as used herein refers to the lower or bottom edges of the respective keels.
  • the chamber is suitably open at its rear end and the centre keel suitably is arranged to start forwardly of the side keels. Preferably also, the tips of the side keels are beneath the tips of the centre keel.
  • the chamber also suitably commences substantially midway along the length of the hull.
  • planing hull shown in the drawings is generally similar to that of Patent Specification 456,662 in that it comprises, at its underside, a chamber or tunnel to enclose a cushion of air which supports the hull in its planing mode.
  • the planing hull in accordance with the preferred embodiment comprises two side keels (2), and a central keel (4) which starts forwardly of the side keels (2) and which terminates at a transverse step (6) in the midships section of the hull.
  • the central part of the underside of the hull is substantially planar to define the top surface or wall (8) of a chamber or tunnel (10) open at its underside and flanked by the side keels (2) and open at its rear end (12), the step (6) defining the front wall of the chamber or tunnel (10).
  • the planar top surface (8) of the tunnel (10) is substantially parallel to the bottom edges or tips (2a) of the side keels (2).
  • the step (6) does not incorporate air vents connected via ducts to an air intake system. Instead, all of the air supplied to the tunnel (10) to form the supporting air cushion is fed via the two passages defined at the underside of the hull between each side keel (2) and the centre keel (4). These passages between the centre keel (4) and side keels (2) also terminate at the step (6). It has been determined that the absence of air vents in the step (6) provides improved entrapment of air in the tunnel or chamber (10) leading to an improved cushioning effect which results in reduced drag at low to medium speeds. In this regard, it is believed that the vents in the step of the previously proposed hull, did, under certain conditions, particularly at low to medium speeds, permit loss of air pressure from the cushion and we have determined that an adequate supply of air can be achieved without these vents.
  • the planar wall (8) of the chamber (10) is spaced above the upper edges of the passages at the step (6).
  • air flowing along the passages and entering the chamber (10) will rapidly decelerate due to the fact that it is entering an enlarged area which will create a back pressure on the forward wall of the chamber (10) defined by the face of the step (6).
  • the side keels (2) are substantially wider than those of the previously proposed hull, and this provides a more efficient planing surface, and greater interior space within the hull for fitting propulsion machinery and other equipment.
  • the side keel width and other significant dimensional relationships are indicated in Table I below.
  • the Table indicates overall ranges for the relationships and actual figures for a given hull will vary within these ranges according to such factors as specific cruising speed, payload and designated sea conditions.
  • TH and KH are taken relative to the baseline of the hull, that is a line between the lowermost edges of the opposite side keels of the hull. TABLE Side keel width. Range of SK/CW is 0.18 to 0.20 Tunnel height. Range of TH/CW is 0.14 to 0.16 Transverse step depth. Range of SD/TH is 0.03 to 0.10 Forward centre keel height (at step). Range of KH/TH is 0.55 to 0.65 Transverse step (longitudinal position. Range of TS/L is 0.45 to 0.46
  • the side keels each incorporate only two spray chines for the suppression of spray whilst the craft is in motion.
  • the chines each consist of a strip (14) extending along the outer surface and inner surface of each side keel and result in only little drag and are of simple construction.
  • the centre keel (4) begins forwardly of the side keels (2). This facilitates channelling of the air at the front of the boat for feeding to the tunnel (10).
  • the forwardly extending centre keel (4) also softens the ride in choppy conditions as it will engage the wave crests prior to the side keels and will dampen the pitching effect.
  • the constant depth tunnel (10) enables trim tabs to be fitted at the back and which can be adjusted to set the bow angle to a desired inclination during planing.
  • the overall effect of the features described is to reduce the drag of the hull throughout the speed range.
  • the hull described herein presents an average reduction of 20 to 25% at high and moderate-to-high speeds and up to 35% at lower speeds, particularly at the transition speed from the floating or displacement mode to the planing mode.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
  • Exhaust Silencers (AREA)
  • Toys (AREA)
  • Cyclones (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

Claims (13)

  1. Gleit-Bootsrumpf für ein Wasserfahrzeug, der zwei seitliche Kiele (2) und einen mittleren Kiel (4) dazwischen umfaßt, wobei der mittlere Kiel (4) hinten an einem Querabsatz endet, der eine vordere Wand eines nach unten offenen Raums (10) bildet, der an jeder Seite von den seitlichen Kielen (2) flankiert wird, wobei sich die seitlichen Kiele (2) jeweils von dem Querabsatz (6) nach vorn erstrecken und ein Paar Durchlasse zwischen dem mittleren Kiel (4) und den seitlichen Kielen (2) bilden, wobei der Querabsatz (6) quer zu den seitlichen Kielen (2) verläuft und die Durchlasse hinten an dem Querabsatz (6) enden, und der Raum (10) dazu dient, ein Luftkissen einzuschließen, das den Bootsrumpf im Gleitbetrieb trägt, wobei Luft dem Raum vollständig über die Unterseite des Bootsrumpfes zugeführt wird, indem sie in den Durchlassen zwischen dem mittleren Kiel (4) und den seitlichen Kielen (2) geleitet wird.
  2. Bootsrumpf nach Anspruch 1, wobei der Raum (10) über seine Länge im wesentlichen konstante Tiefe aufweist.
  3. Bootsrumpf nach Anspruch 1 oder Anspruch 2, wobei der Raum (10) eine im wesentlichen plane obere Wand (8) aufweist.
  4. Bootsrumpf nach Anspruch 3, wobei die obere Wand (8) im wesentlichen parallel zu den Spitzen (2a) der seitlichen Kiele (2) ist.
  5. Bootsrumpf nach einem der Ansprüche 1 bis 4, wobei der Raum (10) an seinem hinteren Ende (12) offen ist.
  6. Bootsrumpf nach einem der Ansprüche 1 bis 5, wobei der mittlere Kiel (4) vor den seitlichen Kielen (2) beginnt.
  7. Bootsrumpf nach einem der Ansprüche 1 bis 6, wobei die Spitzen (2a) der seitlichen Kiele (2) unter den Spitzen des mittleren Kiels (4) liegen.
  8. Bootsrumpf nach einem der Ansprüche 1 bis 7, wobei das Verhältnis der Breite (SK) jedes seitlichen Kiels (2) an einander gegenüberliegenden Seiten des Raumes (10) zur Breite (CW) des Bootsrumpfes an der Grundlinie des Bootsrumpfes im Bereich von 0,18 bis 0,20 liegt.
  9. Bootsrumpf nach einem der Ansprüche 1 bis 8, wobei das Verhältnis der Höhe (TH) der oberen Wand (8) des Raumes (10) über der Grundlinie des Bootsrumpfes zur Breite (CW) des Bootsrumpfes an der Grundlinie im Bereich von 0,14 bis 0,16 liegt.
  10. Bootsrumpf nach einem der Ansprüche 1 bis 9, wobei das Verhältnis der Tiefe (SD) des Absatzes (6) zwischen der oberen Wand (8) des Raumes (10) und den oberen Rändern der Durchlasse zur Höhe (TH) der oberen Wand (8) des Raumes (10) oberhalb der Grundlinie (4) von 0,03 bis 0,10 reicht.
  11. Bootsrumpf nach einem der Ansprüche 1 bis 10, wobei das Verhältnis der Höhe (TH) der oberen Wand (8) des Raumes (10) oberhalb der Grundlinie zur Höhe (KH) der Spitze des mittleren Kiels (4) oberhalb der Grundlinie am hinteren Ende des mittleren Kiels (4) von 0,55 bis 0,65 reicht.
  12. Bootsrumpf nach einem der Ansprüche 1 bis 11, wobei der Raum (10) im wesentlichen in der Mitte der Länge des Bootsrumpfes beginnt.
  13. Bootsrumpf nach Anspruch 12, wobei das Verhältnis der Länge (TS) des Raumes (10) zur Länge (L) des Bootsrumpfes von 0,45 bis 0,46 reicht.
EP88903749A 1987-04-30 1988-04-28 Wasserfahrzeug Expired - Lifetime EP0382722B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AUPI168587 1987-04-30
AU1685/87 1987-06-12
PCT/AU1988/000121 WO1988008387A1 (en) 1987-04-30 1988-04-28 Water craft

Publications (3)

Publication Number Publication Date
EP0382722A1 EP0382722A1 (de) 1990-08-22
EP0382722A4 EP0382722A4 (en) 1991-01-23
EP0382722B1 true EP0382722B1 (de) 1995-09-06

Family

ID=3772144

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88903749A Expired - Lifetime EP0382722B1 (de) 1987-04-30 1988-04-28 Wasserfahrzeug

Country Status (9)

Country Link
US (1) US5140930A (de)
EP (1) EP0382722B1 (de)
JP (1) JPH02503895A (de)
AT (1) ATE127411T1 (de)
CA (1) CA1315158C (de)
DE (1) DE3854433D1 (de)
MY (1) MY103271A (de)
NZ (1) NZ224421A (de)
WO (1) WO1988008387A1 (de)

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0359825B1 (de) * 1987-11-11 1993-02-17 Mitsui Engineering and Shipbuilding Co, Ltd. Gleitboot
US5038696A (en) * 1990-01-30 1991-08-13 Advanced Composite Marine, Inc. Ship's hull having monohull forebody and catamaran afterbody
WO1992019489A1 (en) * 1991-04-29 1992-11-12 Nevid Nominees Pty. Ltd. A boat hull
US5209177A (en) * 1992-07-02 1993-05-11 Outboard Marine Corporation Pontoon-type boat
JPH0687486A (ja) * 1992-09-04 1994-03-29 Yamaha Motor Co Ltd 水ジェット推進艇の船底構造
US5544609A (en) * 1995-06-20 1996-08-13 Miller; James D. Early planing boat hull
AU730629B2 (en) * 1997-07-10 2001-03-08 Ronald John Webster Improvements in boat hulls
US6085677A (en) * 1998-09-11 2000-07-11 Fino Motion Products, Inc. No/low wake, high speed power catamaran hull
US6250245B1 (en) 1998-09-22 2001-06-26 Mangia Onda Co., Llc M-shaped boat hull
GB2350820B (en) * 1999-06-08 2002-01-23 William Francis Pentecost Stable tunnel hull
EP1182126B1 (de) * 2000-08-18 2005-11-30 David R. Craig Bootskörper
WO2003045769A1 (en) * 2001-11-30 2003-06-05 Anthony Jabez Little Multi-hull marine craft
NO315231B1 (no) * 2002-02-22 2003-08-04 Effect Ships Internat As Luftputefartöy
US7328668B2 (en) * 2002-10-07 2008-02-12 Roger Gamble Doughty Guérard Hybrid vee-hull / wing-in-ground effect vessel
US6837176B1 (en) 2003-01-31 2005-01-04 L. Keith Rogerson Vessel transition hull
US20080047477A1 (en) * 2006-02-16 2008-02-28 Glacier Bay, Inc. Boat hull and bait tank design
US7418915B2 (en) * 2006-03-15 2008-09-02 Navatek, Ltd. Entrapment tunnel monohull optimized waterjet and high payload
US7549385B2 (en) * 2007-08-17 2009-06-23 Hansen John F Stepped boat hull with flat pad portions
US7578253B2 (en) 2007-11-26 2009-08-25 Water Skimmer Boats Llc Water skimmer
WO2011053980A2 (en) * 2009-11-02 2011-05-05 Schaefer Jr Louis E Combination catamaran and v-hull
US9038561B2 (en) 2011-02-03 2015-05-26 Navatek, Ltd. Planing hull for rough seas
AU2013254888A1 (en) * 2012-11-06 2014-05-22 Halco Pty Ltd Fishing lure
USD736139S1 (en) * 2013-06-03 2015-08-11 Recreation Unlimited, Llc Boat hull having twin sponsons
USD739331S1 (en) * 2014-10-30 2015-09-22 Jesse W. Munson Boat hull
US9242700B1 (en) 2015-04-01 2016-01-26 3Madmen Wakesurfing boat
USD833955S1 (en) * 2017-02-27 2018-11-20 Eagleblade, Llc Catamaran boat
US10518843B1 (en) * 2017-10-10 2019-12-31 Morrelli & Melvin Design & Engineering, Inc. Planing hull catamaran for high speed operation in a seaway

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US3239856A (en) * 1964-10-27 1966-03-15 Stocking Stannard Boat construction
US3469549A (en) * 1968-01-11 1969-09-30 Randolph S Rae Planing boat
US3625173A (en) * 1969-08-08 1971-12-07 Mitton Hulls for power boats
GB1218688A (en) * 1969-09-20 1971-01-06 Les Mitton Hulls for power boats
NO136743C (no) * 1969-12-23 1977-11-02 Wilhelm Boden Glideb}t.
AU456662B2 (en) * 1971-01-13 1975-01-09 Leonard Dirk Stolk Improved air cushioned planing hull
JPS4928091A (de) * 1972-07-10 1974-03-13
US3902445A (en) * 1972-07-11 1975-09-02 Leonard Dirk Stolk Air-cushioned planing hull
NO128434B (de) * 1972-08-01 1973-11-19 Lauenborg J T
GB1542639A (en) * 1975-12-09 1979-03-21 Unitex Ltd Planing hulls for boats
FR2478570A1 (fr) * 1980-03-21 1981-09-25 Nguyen Manh Embarcation notamment a voile
FR2515125A1 (fr) * 1981-10-28 1983-04-29 Garcin Steve Vehicule pouvant se deplacer soit sur un support solide, soit sur un support fluide, soit indifferemment sur l'un de ces supports, comportant au moins une chambre divergente-convergente permettant de reduire sa resistance a l'avancement
JPS5950890A (ja) * 1982-09-14 1984-03-24 ドナルド・イ−・バ−グ 空気浮上ボ−ト船体
IT212309Z2 (it) * 1987-07-01 1989-07-04 Akzo Srl Scafo per imbarcazioni a motore
EP0359825B1 (de) * 1987-11-11 1993-02-17 Mitsui Engineering and Shipbuilding Co, Ltd. Gleitboot

Also Published As

Publication number Publication date
ATE127411T1 (de) 1995-09-15
MY103271A (en) 1993-05-29
WO1988008387A1 (en) 1988-11-03
CA1315158C (en) 1993-03-30
JPH02503895A (ja) 1990-11-15
US5140930A (en) 1992-08-25
NZ224421A (en) 1990-11-27
DE3854433D1 (de) 1995-10-12
EP0382722A1 (de) 1990-08-22
EP0382722A4 (en) 1991-01-23

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